<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      //       const addFive = makeAdder(5);
      // console.log(addFive(10)); // 15
      // console.log(addFive(20)); // 25
      function makeAdder(a) {
        function fn(b) {
          b = b + a
          return b
        }
        return fn
      }

      const addFive = makeAdder(5)
      console.log(addFive(10)) // 15
      console.log(addFive(20)) // 25
    </script>
  </body>
</html>
